Norfolk Island Pine Diseases
Gary W. Moorman, Professor of Plant Pathology
|ANTHRACNOSE||Small dead areas form on needles and the entire needle dies. Small black fungal fruiting bodies are seen in the dead tissue. Large portions of branches brown and needles fall.||Colletotrichum derridis||Avoid overhead watering. Keeping the surface of the foliage dry will prevent this disease.|
|BRANCH DROOP||Excessive drooping of branches although trunk is straight. Plants develop poorly.||Low light intensity||Provide at least 6000 ft-c of light to plants more than 6 inches tall.|
|ROOT ROT||Plants grow slowly and wilt. Roots are small, brown to black, and are soft and rotting.||Cylindrocladium or Pythium||Pot in pasteurize mix. Maintain even soil moisture.Apply a fungicide to protect plants.|
|YELLOWING||Branch tips and the main growing tip is yellow instead of dark green.||Micronutrient deficiency||Apply a micronutrient solution.|
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